— It often makes us ________.
A:jump
B:to jump
C:jumping
D:jumped
— Excuse me. What's that in the picture?
— It's _____ orange hat.
用“☆”定义一种新运算:对于任意有理数a和b,规定a☆b=ab2+2ab+a.
如:1☆3=1×32+2×1×3+1=16.
(1)求(﹣2)☆3的值;
(2)若(a+12☆3)☆(﹣12)=8,求a的值;
(3)若2☆x=m,(14x)☆3=n(其中x为有理数),试比较m,n的大小.
关于位移和路程,下列说法中正确的是( )
“从点滴做起,共建节约型校园”。以下行为符合该倡议的是( )